The nitrogen adsorption data of macroporous and hypercrosslinked adsorbents at 77 K were measured in the relative pressure range of 10(-6) to 0.99. The Brunauer-Emmett-Teller (BET) surface area, micropore volume, pore size distribution, and fractal dimension of two adsorbents were evaluated from analysis of N(2) gas adsorption isotherms. The estimated surface fractal dimensions D of macroporous and hypercrosslinked adsorbents using the modified fractal Frenkel-Halsey-Hill (FHH) model were 2.471 and 2.709, respectively. Compared with the results of N(2) adsorption isotherm analysis, it should be noted that the surface fractal dimension D was related to the pore size distribution of the adsorbents. The more well-developed the microporous structure of a polymeric adsorbent, the larger the fractal dimension D. Moreover, the adsorbents were also analyzed by transmission electron microscopy (TEM), confirming the surface irregularities and more sophisticated microporous structure of the hypercrosslinked adsorbent as compared to the macroporous adsorbent.